Paper-drying machine.



' J. 0. WOODSOME.

PAPER DRYING MACHINE.

APPLICATION FILED NOV. 20, 1913.

Lmmw

Patented. Feb. 23, 1915.

2 SHEBTSSH EBT 1.

J. O. WOODSOME.

PAPER DBYINGMACHINE.

APPLICATION FILED NOV. 20, 1913.

Patented Feb. 23, 1915.

2 $HEETS-SHEET 2 JOHN O. WOODSOME, OF CHICAGO, ILLINOIS,

r in.

ASSIGNOR TO CRANE COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PAPER-DRYING MACHINE.

maniac.

Application filed'November 20, 1913. Serial No. 802,012.

To all whom it may concern:

Be it known that I, JOHN O. WOODSQME, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and use ful Improvements in Paper-Drying Machines, of which the following is a specification.

This invention relates generally to the class of paper drying machines, and has reference more particularly to improvements in drying machines of the heated cylinder type, such as used in connection with the drying out of the Wet paper stock, or

the like.

It is customary in this art to pass the Wetstock or Web oversteam heated rolls in or der to drive out the moisture from the web as it progresses rearwardly through the machine. During this'operation the web gives off large volumes of vapor and steam, which is particularly dense at the wet end of the machine, and which fills the drying'room with heavy moisture laden air to the discomfort of the. operatives, and further tends to have a deteriorating eflect on the building. This condition is further productive of an uneven drying out of paper, inasmuch as the web partially re-absorbs the moisture contained in the vapor and steam given 01f in the vicinity of the machine, and which uneven drying out frequently results in the breakage of the web and consequent delay to the drying operation. The degree of reabsorption is more pronounced at points where the web passes through the vapor pockets located between adjacent rolls in the machine.

The purpose of this invention is toovercome these objections, and with this end in view, I provide improvements in the means for effecting the prompt removal of the vapor given off by-the machine, and further designed to prevent the i e-absorption of the vapor by the paper web its passage through the machine.

One ofthe main objects of this invention is the provision in a drying machine of im proved means so constructed and arranged as to abstract the steam and vapor rising from the machine, and adapted to deliver the same in a dry conditionto points in the machine as a positive heating agent. v

A further object of this lnvention, is to provide a novel supplementary means dis- Specification of Letters Patent.

Patented Feb. 23, 1915.

posed in proximity to the dry endof the machine and adapted to return and utilize the dry heated air rising therefrom, which heretofore has been allowed to go to waste.

My invention also contemplates certain novel details of construction, combination and arrangement of parts of the improved device, adapted to increase the dryin capacity of the machine in an economicafand eflicient manner, and whereby certain other advantages are attained as will be more fully described hereinafter.

The foregoing, together with such other objects as may hereinafter appear, or are incident to my invention, I attain by means of a construction which is illustrated in the preferred form in the accompanying drawings, wherein:

Figure 1 represents a side elevation of a drying machine, illustrating the application of my improvements thereto;

Figure 2 is a sectional view taken transversely through Figure .1 along the line gradually parts with its contained moisture as it passes over and between the rolls, until it emerges at the rear or dry end as a dried product.

Incarrying out my invention, the main suction hood 5 is disposed above the machine to overhang the greater portion of the upper row of the rolls 4, and extends from a point above the initial rolls of the machine to a point short of the dry end. This suction hood may be of any desired type of construction, but I prefer to use that type of hood which is described and set forth in my .co-pending application Serial Number 796,163, filed October 20, 1913. Y

the moisture Mounted below the level of the floor 6 is an air cooling device or condenser 7 connected at one side with the front end of the suction hood 5 by means of the pipe connecnicates with the suction side conserving tion 8, and at its other side with an air heating device 9 throu h the interposed tubular connectionlO. his heater 9 commuof any suitable air forcing device, such as the fan blower indicated at 11, and in Figure 3 I have illustrated a practical form of heating device which is adapted to utilize the exhaust from the fan engine 20 through the pipe connection 20. j

One of the tion resides,

features in which this invenis the provision of means for and returning the hot and dry air given oif at the dry end of the machine, with a view to increase the drying capacity of the machine as a whole, and which heretofore has been allowed to go to waste. Referring to Figure 1 it will be seen that to attain this feature, I provide a supplementary and smaller hood 12 disposed to overhang the dry or rear end of the machine. The hood 12 preferably tapers in a vertical direction away from its central portion, from which point it communicates with the heater 9 through the pipe 13, whose lower terminal is connected with the tubular connection 10, and consequently is in the suction line of the fan blower 11.

From the foregoing, it will be clear that the heavy vapor given off by the machine is induced to flow directly from the main suction hood to the condenser, and that the comparatively dry and hot air caught by the rear hood is likewise conducted to the heater for the application of additional heat thereto.

In order to carry the dry and heated air to the machine in an effective manner I provide an oppositely extending pipe 14 which extends from its. junction 11, with the delivery side of the blower 11, in a longitudiregulate and control the flow of the nal direction below the flow level and beneath the series of rolls, to supply the ducts 15. y

These duets 15. are disposed to extend lengthwise and centrally of the pit of the floor 6, and are here shown as being preferably three in number, though any desired number and arrangement thereof may be employed as the particular requirements of the situation may demand. As previously.

intimated, the ducts communicate with the supply pipe 14 and in the manner indicated in the drawings; dampers 14 beingprovided in the oifs'et portions of the pipe to dry and hot air therethrough into the ducts.

From a reference to Figure 1 it will be apparent that in the passage of the wet web over and between the heated rolls 1 forming the machine, a large amount of the wapor given o'if from the web during this operation collects in the upper and o'wer vapor pockets 16 and 16 respectively, which are formed between adjacent rolls and that portion of web'whi'ch may be passing over and under these said rolls. In this manner the vapor is to a great extent bottled up in these pockets and is partially reabsorbed by the web, producing an uneven drying out of the latter in the transverse direction as the marginal edges being at the open ends of the pockets dry out quicker than the intermediate portion, with the result that breakage of the web frequently occurs and the drying operation is delayed and the capacity of the machine seriously reduced.

At intervals in the lower row of rolls are nues of access for vapor past the sides of the.

intermediate roll positioned just above the space to adjacent vapor pockets 16 and aggravate the condition therein referred to. In order to dissipate the vapor in these spaces 17 and to increase the drying action at adjacent points, the upper wall of each of the ducts is tapped at intervals to receive the vertically extending short pipe sections 17, which are provided to circulate hot air directly beneath these said spaces 17.

Extendin from the si e wall of the ducts are the upper and lower series of risers or branch delivery pipes 18 and 19, whose horizontal upper nozzles 18 and 19 respectively, communicate with and slightly project into the open ends of the upper and lower vapor pockets 16 and 16, and are constructed and designed to deliver a blast of hot air which effectuall dissipates the vapor collected in these poc ets'. The risers 17, 18 and 19, are preferably supplied with dam ers, arranged therein as in the manner in icated in the drawings, in order to regulate the flow therethrough to the different points in the machine.

The oppositely extending pipe 14, bifurcated substantially at 11, has its shorter section supplying the duct 15 immediately underneat the initial rolls of the wet end where the vapor given ofi is more dense than, for example, at that portion of the machine disposed above the intermediate duct 15, which latter has a more extended area to supply a greater number of delivery or feed pipes 18 and 19 and at a consequent reduction in pressure over that existing in the duct at the wet end. This arrangement is supplemented by the provision of the dampers 14 which may be manipulated to control the supply of hot air from the ipe 14 to the ducts. The rear duct is pre erably positioned beneath those rolls at the dry end over which the rear suction hood overhangs, so as to insure the prompt return by the hood of any surplus heat supplied by the duct, together with the comparatively hot sand dry air given off by the rolls, and which has heretofore been allowed to go to waste.

The opera on is substantially as follows:

at intervals longitudinally 1,129,156 v tit The heavy vapor rising from the machine is caught by the main suction hood 5, and through the agency of the blower 11 is induced to'flow through the pipe 8 into the condenser 7, where it parts with its contained moisture. From thence the dehydrated air is caused to flow into the heater 9, where it is raised to the desired temperature. As the air returned by the rear hood 12 is in a comparatively dry state, it is passed directly to the heater through the pipe connection 13. The now dry and hot air is forced to the ducts 15 through the pipe 14: and is fed below the machine and into the pockets, whereupon the saturated air is kept moving, and rising rapidly is caught by the suction hood with the result that the saturated air is effectually removed from contact with the material, and is also prevented from escaping into the surrounding atmosphere.

Among other advantages attained by my invention, may be mentioned that at com-,

paratively little cost of maintenance, the drying capacity of the machine is increased to a considerable extent; that it eliminates the necessity for placing expensive installations of heating coils under the roof of the drying room, heretofore provided in an en deavor to prevent precipitation of the moisture as the fog rises in the drying room; and that themethod herein described of removing the moisture laden air, is entirely independent of atmospheric conditions, and by effecting this removal the efliciency of the machine is materially increased.

From the foregoing, the means and method of effecting a complete control of theair between the pit and the hood, and in a manner independent of atmospheric conditions, will be clearly apparent to those skilled in the art.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the following 1. In combination with a fabric drying machine of the heated cylinder type, of a vapor suction hood disposed to overhang the wet or feed end of the machine and in position to receive and abstract the moist vapor given ofl by the material in its travel rearwardly over the cylinders, an air forcing deviceconnected with the outlet of sand hood, air treating means communicating with said air forcing device, and a supply duct disposed in a plane below that of the hood and formed with blast outlets located with reference to the cylinder pockets and adapted to dissipate vapor away from said pockets for its abstraction by said suction hood;

2. In combination with a fabric drying machine of the heated cylinder type, of a vapor abstracting hood overhangmg the wet end of the machine, an air forcing device, air condensing and heating means communicating with said hood and said air forc-, ing device, and a supply duct having, blast outlets located with reference to the cylinder pockets and adapted to dissipate vapor away from said pockets for its abstraction by the suction hood.

3. In combination with a fabric drying machine of the heated cylinder type, of a Vapor abstracting hood overhanging the wet end of the machine, an air forcing device, air condensing and heating means communicating with said hood and said air forcing device, and a supply duct disposed in a plane below that of the hood and having blast outlets located with reference to the cylinder pockets and adapted to dissipate vapor away from said pockets for its abstraction by the suction hood. 4. In combination with .a fabric drying machine of the heated cylinder type, of a vapor suction hood disposed to overhang the web or feed end of the machine and in position to receive and abstract the moist vapor given off by the material in its travel rearwardly over the cylinders, an air forcing device connected with the outlet of said ed to dissipate vapor from said pockets for its reception by said suction hood, and means variable to govern the rate of flow through said blast outlets.

5. In a fabric drying machine of the heated cylinder type, a main suction hood for the front end of the machine, a supplementary hood for the rear end thereof, air forcing means communicating with both hoods, and supply duct sections leading from said means and located with reference to the hood and cylinders, each of said sections being formed with blast outlets adapted to direct blasts of heated air between cylinders adjacent thereto. v

v 6. In a fabric drying machine of the heated cylinder type, a main suction hood for the front end of the machine, a supplementary hood for the rear end thereof, a1r forcing means communicating with both hoods, supply duct sections leading from said means and located with reference to the hood and cylinders, each of said sections being formed with blast outlets adapted to direct blasts of heated air between cylinders adjacent thereto, and means variable to govern the rate of flow through the outlets of each of said sections.

7. In a paper drying machine, the combination of a plurality of cylinders over which the paper web is designed to pass, said cylinders being diagonally arranged in V hood for the rear end thereof,

rows and spaced away to thereby form a lower vapor pocket and an upper vapor pocket communicating diagonally with the lower pocket, and means for dissipating the vapor collecting in said pockets comprising an air supply duct having a blast outlet disposed with referencce to said lower pocket,

substantially as described.

suction line of the main suction hood, ducts located with reference to the hoods and communicating with the air forcing member, and tubular means extending therefrom to direct currents of dry air into the vicinity of the machine.

In testimony whereof I have hereunto' signed my name in the presence of the two subscribing witnesses.

I JOHN O. l/VOODSOME.

Witnesses:

W. HERBERT Fowims,

Moon. 

